Question

Calculate the ΔG°rxn using the following information. 4 HNO3(g) + 5 N2H4(l) → 7 N2(g) + 12 H2O(l) ΔG°rxn = ? ΔH°f (kJ/mol) -133.9 50.6 -285.8 S°(J/mol∙K) 266.9 121.2 191.6 70.0

I can't seem to figure this one out. I tried only taking into account gas states. Not sure where I am going wrong. I solved for delta H and S then plugged into the equation delta G= delta H-(T)(delta S)